Fuse construction



June 1.1,\ 1940.

I w. o. SCHULTZ FUSE CONSTRUCTION Original Filed May 24, 1934 INVENTOR. fll/VMMQ Sofa/2f;

ATTOL EY.

Patented June 11, 1940 2,204,320

umrso STATES PATENT OFFICE 2,204,320 FUSE CONSTRUCTION William 0. Schultz, South Milwaukee, Wis, as-

signor to Line Material Company, South Mil waukee, Wis., a corporation of Delaware Original application May 24, 1934, Serial No.. 127,250. Divided and this application August 4, 1939, Serial No. 288,445

3 Claims. (01. 200-114) This invention relates to fuse constructions jointly provide an opening through which the and is particularly directed to a drop-out type of lower end of the fuse tube projects. The housing fuse. is preferably cut away adjacent its lower portion This application is a division of my copending and provided with side flanges 4! to provide space application Serial No. 727,250 filed May 24, 1934, within which the rocking contact member 42 for Fuse construction. may move. This rocking contact member will be Objects of this invention are to provide a novel described in greater detail hereinafter. form of fuse, such as the expulsion fuse type, in The housing is provided with a baffle 43 and which the fuse tube operates first in the manner with an upper terminal member 44 and a lower of an expulsion fuse, then moves downwardly and terminal member 45. These members carry m increases the gap in the circuit, and finally comes spring arms or contact members 46 and 41 row to rest projecting outwardly from the body porspectively, the member 41 engaging around the tion 50 as to give a visual signal indicating that lower contact or sleeve-like cradle member 49, the fuse has blown. and the upper member engaging the upwardly In greater detail, objects of this invention are tapered, conical end 49 of the nut for the upper u to provide a housed type of expulsion fuse in end of the fuse tube 50. which the fuse tube is biased towards motion This conical or tapered portion 49 thus does axially of the fuse tube and downwardly and not interfere with the free downward sliding outwardly from the housing and is normally remotion of the fuse tube, although it is gripped strained from such motion by the fuse link, the between the spring arms 46. The upper end of w rupturing of the fuse link releasing the fuse tube the member 49 is positioned loosely within the and allowing such outwardly biased fuse tube to aperture 5| of the clip 52 carried by the upper be projected downwardly andoutwardly from end of the door. This clip is provided with a the housing. downwardly turned portion 53 which fits between Further objects are to provide a construction the converging spring arms 46 and thus serves to E5 in which the lower fastening means for the fuse releasably hold the upper end of the door closed link is so constructed that it tends to quickly even if the fuse tube is removed. withdraw whatever remains of the lower'portion The door is provided with an abutment 54, of the fuse link from the fuse tube, such action against which the lower contact 49 bears. This 39 being also assisted by gas pressure generated lower contact is provided with a hook member within the fuse tube, so that the combination of l! which engages over the strap or anchoring these two features insures the extinguishing of member 55 carried by the door. Springs 51 bear the are within the fuse tube in a much shorter against the ears 59 carried by the contact 49 time than with the usual type of expulsion fuse, and thus hold the fuse tube to the door. the fuse tube itself subsequently sliding vertically The fuse tube is provided with a lower sleeve downwardly and increasing the gap formed in the or member 69 which is equipped with rollers 60 circuit. engaged by-the arms or hooks ii of the rocking Further objects are to provide a construction contact 42, such rocking contact being spring in which the downward motion of the fuse tube urged outwardly, as indicated, and being conis facilitated, in which latching means are pronected by means of a flexible conducting leader vided for normally holding the fuse tube in ele- 62 to the contact 49. The latch arm ii is urged vated position, and in which means are provided toward a released position by spring 39' on for positively releasing the latching means when pintle pin 32' on which the lever arm Si is the fuse link is ruptured thus insuring the release mounted.

of the f use tube. It is to be noted, however, that the rocking con- An embodiment of the invention is shown in tact 42 is provided with an extended lip 63. over the accompanying drawing, in which: the lower end of which the fuse link 64 passes,

The single view is a side elevation of the device such link being preferably positioned within a with parts in vertical section, such view showing slot formed in the lower portion of the lip 69, as so in dotted lines the final position of the fuse tube indicated in the figure. The free end of the link after the fuse link has been ruptured. is clamped by means of the thumb nut 65. The Referring to the figure, it will be seen that the rocking contact 42 is biased so as to tend to rock housing 99 is provided with a door 39 pivoted in a clockwise direction, as indicated by the arrow adjacent its lower end in'any suitable manner as in the figure. by the pintle pin 49. The door and the housing It is to be noted that the sleeve 59 in reality 55 downwardly, thus assisting the action of gravity. e nk e cessive mech n c l St and Spring 66, in addition to gravity, exerts a force ng nst u ted and arran d to be r ed toreacting against latch arm 6|. ward a released position when the fuse link is The operation of the apparatus is as follows: ruptured- 10 When the fuse blows, the fuse link is ruptured. 2- A fuse c nst i comprising a housing 10 The lower pivoted contact member 42 is released having an open bottom and having contacts, and swings in a clockwise direction, withdrawing guiding m ans m unted w t n sa d ho s n a the h0ok-like arms 6| from the rollers 60, th fuse tube slidably supported within said guiding. releasing the fuse tube 50. The fuse tube drops means, a Spring encircling Said fuse u e d downwardly into the dotted line position and r n sa d us tu e towa ds sa d p n ttom. 15

ll be seen that this invention provides a Said fuse in Operative and restraining Position 20 downwardly from the housing and thus increases Spring o exerting a ce ct aga nst Said 5 the gap in the electric circuit. lever- It will be seen further that the construction A cu t nterrupting switch structur comis simple, is easy to handle, that the fuses are prising a housing having an open bottom and easy to replace, and that the device is eminently having Contacts, u i g me ns mounted Within practical. the housing, an arcing tube slidably supported Although this invention has been described in W n Said guiding mea 8 Spring encircling 30 means, a spring encircling said fus t and means for releasing said lever under overload 0 said fuse tube having spaced contacts normally WILLIAM O. SCHULTZ. 

